Enrico Fraccaroli (Galfurian)
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/// @file readdir.c
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/// @brief Function for accessing directory entries.
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/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include "sys/dirent.h"
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#include "process/scheduler.h"
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#include "system/syscall.h"
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#include "system/printk.h"
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#include "sys/errno.h"
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#include "stdio.h"
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#include "fs/vfs.h"
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#include "string.h"
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int sys_getdents(int fd, dirent_t *dirp, unsigned int count)
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{
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if (dirp == NULL) {
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printf("getdents: cannot read directory :"
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"Directory pointer is not valid\n");
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return 0;
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}
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// Get the current task.
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task_struct *task = scheduler_get_current_process();
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// Check the current FD.
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if (fd < 0 || fd >= task->max_fd) {
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return -EMFILE;
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}
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// Get the file descriptor.
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vfs_file_descriptor_t *vfd = &task->fd_list[fd];
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// Check the permissions.
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#if 0
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if (!(task->fd_list[fd].flags_mask & O_RDONLY)) {
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return -EROFS;
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}
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#endif
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// Get the file.
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vfs_file_t *file = vfd->file_struct;
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if (file == NULL) {
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return -ENOSYS;
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}
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// Clean the buffer.
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memset(dirp, 0, count);
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// Perform the read.
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int actual_read = vfs_getdents(file, dirp, vfd->file_struct->f_pos, count);
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// Update the offset.
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if (actual_read > 0)
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vfd->file_struct->f_pos += actual_read;
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return actual_read;
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}
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